Law 68/1999 - Application for geographical compensation and partial exemption”; Note of 10 October 2001 concerning “Response to question on conventions - Law 68/1999, article 11.2”; Circular No. 77 of 6 August 2001 concerning “Obligatory hirings.
- Circular Nº 77 de 6 de agosto de 2001 sobre "Contrataciones obligatorias. Empresas de servicios de limpieza e integrados".